kldload vmm partial lockup

[Neel Natu]

Hi Joe,

On Sun, Jan 19, 2014 at 2:21 PM, Joe Maloney <jpm820 at gmail.com> wrote:
> I’ve been trying to get bhyve to work on a system with the following specs:
>
> FreeBSD 10.0 64 bit
> ASUS P6T Deluxe
> Intel i7 920
>
> According to what I’ve researched my cpu should have the VT-D extensions.  However many users of this motherboard have complained about ASUS not properly supporting VT-D with Xen and something about a problem with tables getting corrupt due to a problem with the bios.  On the third link below which is the Xen wiki it even states that this motherboard needs a bios update which is not available to the public.
>
> https://communities.intel.com/thread/28389
>
> http://vip.asus.com/forum/view.aspx?id=20090402224408018&SLanguage=en-us&board_id=1
>
> http://wiki.xen.org/wiki/VTd_HowTo
>
> I am curious though if this would be what would be causing my problem with bhyve?  I suppose I am willing to just by a new motherboard if so.
>
> I can run kldload vmm and I see a bunch of text fly by and then something about uhci interrupt problem.  As soon as that happens the messages repeats my network drops and no keyboard input.  However the message repeats and it doesn’t appear that the system has fully locked up otherwise.  However on another system that works I notice that kldload VMM does not show this information it just loads the module.
>
> Is there a way I can gather more logs somehow so that I can determine what text is appearing before the uhci errors?  Perhaps some kind of dump procedure?  Or is there a way I can confirm that freebsd can properly see and utilize the VT-D extensions.  VirtualBox runs fine with the VT extensions enabled.  I also made sure VirtualBox wasn’t installed or loaded before I tried bhyve.  I’ve tried to research for a week or two before posting here.
>

I have a patch to not initialize the iommu unless there are passthru
devices explicitly configured for bhyve to use.

It is available here:
http://people.freebsd.org/~neel/patches/bhyve_iommu_init.patch

Could you give it a spin and see if it helps with the ASUS system?

best
Neel

> Joe Maloney
>
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